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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2/21/25 12:03, Rik van Riel wrote: > On Fri, 21 Feb 2025 02:58:01 +0100 > Borislav Petkov wrote: > > >> CPU_SUP_AMD selects X86_BROADCAST_TLB_FLUSH which depends on CPU_SUP_AMD which >> selects X86_BROADCAST_TLB_FLUSH which depends on CPU_SUP_AMD... >> >> You need to make up your mind in which way the dependency should be. Certainly >> not circular. > > I've attached the new version below: > > ---8<--- > > From 8da3d9f792427e434900a45e6d6391b28cf834d1 Mon Sep 17 00:00:00 2001 > From: Rik van Riel > Date: Thu, 20 Feb 2025 21:25:08 -0500 > Subject: [PATCH 04/16] x86/mm: get INVLPGB count max from CPUID > > The CPU advertises the maximum number of pages that can be shot down > with one INVLPGB instruction in the CPUID data. > > Save that information for later use. > > Signed-off-by: Rik van Riel > Tested-by: Manali Shukla > Tested-by: Brendan Jackman > Tested-by: Michael Kelley > Acked-by: Dave Hansen > --- > arch/x86/Kconfig.cpu | 5 +++++ > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/asm/tlbflush.h | 3 +++ > arch/x86/kernel/cpu/common.c | 3 +++ > 4 files changed, 12 insertions(+) > > diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu > index 2a7279d80460..c371b94aa5d7 100644 > --- a/arch/x86/Kconfig.cpu > +++ b/arch/x86/Kconfig.cpu > @@ -401,6 +401,10 @@ menuconfig PROCESSOR_SELECT > This lets you choose what x86 vendor support code your kernel > will include. > > +config X86_BROADCAST_TLB_FLUSH > + def_bool y > + depends on 64BIT I think what you really want is: depends on CPU_SUP_AMD && 64BIT And then delete the select X86_BROADCAST_TLB_FLUSH below. Otherwise, won't it be y even if CPU_SUP_AMD isn't y? Thanks, Tom > + > config CPU_SUP_INTEL > default y > bool "Support Intel processors" if PROCESSOR_SELECT > @@ -431,6 +435,7 @@ config CPU_SUP_CYRIX_32 > config CPU_SUP_AMD > default y > bool "Support AMD processors" if PROCESSOR_SELECT > + select X86_BROADCAST_TLB_FLUSH > help > This enables detection, tunings and quirks for AMD processors > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > index 508c0dad116b..b5c66b7465ba 100644 > --- a/arch/x86/include/asm/cpufeatures.h > +++ b/arch/x86/include/asm/cpufeatures.h > @@ -338,6 +338,7 @@ > #define X86_FEATURE_CLZERO (13*32+ 0) /* "clzero" CLZERO instruction */ > #define X86_FEATURE_IRPERF (13*32+ 1) /* "irperf" Instructions Retired Count */ > #define X86_FEATURE_XSAVEERPTR (13*32+ 2) /* "xsaveerptr" Always save/restore FP error pointers */ > +#define X86_FEATURE_INVLPGB (13*32+ 3) /* INVLPGB and TLBSYNC instruction supported. */ > #define X86_FEATURE_RDPRU (13*32+ 4) /* "rdpru" Read processor register at user level */ > #define X86_FEATURE_WBNOINVD (13*32+ 9) /* "wbnoinvd" WBNOINVD instruction */ > #define X86_FEATURE_AMD_IBPB (13*32+12) /* Indirect Branch Prediction Barrier */ > diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h > index 3da645139748..09463a2fb05f 100644 > --- a/arch/x86/include/asm/tlbflush.h > +++ b/arch/x86/include/asm/tlbflush.h > @@ -183,6 +183,9 @@ static inline void cr4_init_shadow(void) > extern unsigned long mmu_cr4_features; > extern u32 *trampoline_cr4_features; > > +/* How many pages can we invalidate with one INVLPGB. */ > +extern u16 invlpgb_count_max; > + > extern void initialize_tlbstate_and_flush(void); > > /* > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c > index 7cce91b19fb2..742bdb0c4846 100644 > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -95,6 +95,8 @@ EXPORT_SYMBOL(__num_cores_per_package); > unsigned int __num_threads_per_package __ro_after_init = 1; > EXPORT_SYMBOL(__num_threads_per_package); > > +u16 invlpgb_count_max __ro_after_init; > + > static struct ppin_info { > int feature; > int msr_ppin_ctl; > @@ -1030,6 +1032,7 @@ void get_cpu_cap(struct cpuinfo_x86 *c) > if (c->extended_cpuid_level >= 0x80000008) { > cpuid(0x80000008, &eax, &ebx, &ecx, &edx); > c->x86_capability[CPUID_8000_0008_EBX] = ebx; > + invlpgb_count_max = (edx & 0xffff) + 1; > } > > if (c->extended_cpuid_level >= 0x8000000a)